The tension in the above string is 89.6 N. Calculate the mass of a 4 m long piece of the steel string.

To calculate the mass of the steel string, we can use the following formula:

mass = tension / acceleration due to gravity

In this case, the tension in the string is given as 89.6 N. The acceleration due to gravity is approximately 9.8 m/s^2.

Substituting the given values into the formula:

mass = 89.6 N / 9.8 m/s^2

Simplifying the expression:

mass = 9.14286 kg

Therefore, the mass of the 4 m long steel string is approximately 9.14 kg.